Comedian Robin Williams – advised by doctors to cancel four performances in South Florida – now has reportedly been hospitalized with heart trouble.

The Miami Herald reported Williams, 57, was admitted after complaining of shortness of breath. The Los Angeles Times reported he was being treated in the intensive care unit. Williams, 57, has been on an 80-city tour of his “Weapons of Self Destruction” show since September and has done shows in 11 cities over the past three weeks.